Improvement in altitude-instruments



H. LINTDN.

Altitude Instrumentsu N0.148,222, Patented March 3,1874.

STATES-f APA'IEivr OFFICE.'

HARVEY-LINTON, OF BROOKVILLE, PENNSYLVANIA.

IMPROVEMENT lIN Ammonia-INSTRUMENTS.

Specification forming part of Letters Patent No. 148,222, dated March v3, 187,4; application filed October 25, 145573.

To all whom t Amay concern:

Be it known that I, HARVEY LrNToN, of Brookville, in the county of Jefferson and State of P ennsylvania, have invented a new and useful Improvement in Combined Level and Clinometer; and I do hereby declare the following to be a full, clear, and'exact description thereof, reference being had to the accompanyin g drawing making a part of this specilication, in whichp Figure l is a front view, inperspective, of my improved level and clino1neter;'and Fig. 2 is a sectional view thereof through the line A, B of Fig. 1.

Like letters of referenceindicate like parts in each.

l\l y improvement relates to the construction of a combined level and clinometer, in which a spirit-level and reliecting-mirror are com bined with an arm, graduated are, and slit or telescope in such a way that the instrument may'be employed easily and conveniently for use in laying out levels or measuring altitudes or depressions.

To enable others skilled in the art to make and use my improvement, I will proceed to depleasure, the essential parts being a slit, tube,

telescope, or equivalent device for a line of sight, a spirit-level, a. retlecting-mirror, a graduated arc, and an armor index.

In the form shown. the telescopic view or slit, which gives the line of sight, is represented iu frame A, along the line A B, the aperture for the eye being at al, and the spiderthreads at s. At or near one end of the frame, and in suitable position with reference to the telescopic slit, is pivoted an arm, B, in which is mounted a spirit-level, c. The hole b is made opposite the level, both through the arm B and frame A,in order to supply light to the level c, and also to a reflecting-mirror, e,'which is arranged opposite to the level c, andiu such position that when the bubble in the level comes tothe center, or at such point as to indicate that the level in arm is in a horizontal position, (to indicate which a pin, a2, may be arranged at the side of the level and between it and the mirror,) the position of the bubble will be reflected from the mirror back to the eye at al. The opposite or free end of the arm may have any suitable index, as shown at d, to be used in connection with a system of graduation, as shown at di, and such graduation may be extended through any desired part of the circle, or through the Whole; or two graduated circles may be larranged-one at di and the other at ZZ- eachn connection with suitable indexes on the arm B; but in this respect I do not limit myself, and, in connection with the arm B, I employ any desired or known style or system of graduation and tained, and the arm Bis shifted in position till the bubble in the level c indicates that the level is horizontal. The reading then on the graduated arc will give the angle ot' elevation or depression.

- The manner of using itin laying out levels vand running grade-links will be obvious to those skilled in the art.

What I claim as4 my invention, to secure vby Letters Patent, is

A combined -clinorneter and level having a and desire telescope or slit for a line of sight, a movable arm carrying a level, a retlectingiinirror, andv graduated arc, relatively arranged and operative substantially as set forth.

In testimony whereof I,.the said HARvEY LrNToN, have hereunto set my hand. HARVEY LINTON'.

Witnesses: ALFRED WALTER,

` W. F. MOORE.- 

